Differential Dyeing Cotton. Part 1 – Preparation and Evaluation of Differential Dyeing Cotton Yarn

Colourless cationic and anionic cellulose-reactive compounds have been prepared and applied to cotton yarns. Yarns pretreated with cationic reagents shows better uptake of acid and direct dyes than does untreated yarn, and since the degree of differential uptake depends on the level of pretreatment, which may be readily controlled, fabrics exhibiting a variety of tone-on-tone effects may be produced. Pretreated cotton may be converted to viscose or cellulose triacetate fibre with retention of the modified dyeing properties, thus providing routes to differential dyeing viscose and triacetate fibres